Rock-drill.



w. Woon;V

ROCK DRILL. APPLIOATION FILED JAN. zo, 1911.

Patented July 11, 1911. v

Jay/f WARREN WOD,. OF IATERSON, NEW JERSEY.

ROCK-DRILL.

Specification of Letterslatent.

Patented J-uiy ii, 1191i.

Application led January 20, 1911. Serial No. 603,711.

To .all 'whom it may concern.'

Be it known that I, WARREN wWoon, a citizen of .the United States, residing at Pater-y son, in the county of Passaic and State of New Jersey, have invented a certain new.. and useful Improvement in Rock-Drills, of

Y which the following is a specification.

The invention relates to the construction ofthe lower cylinder-head or front head and the object of the invention is to provide a head andpacki-ng-sleeve therefor so con-` structed as to permit the sleeve to be removed easily and a new one substituted when required, with means for holding the"` sleeve reliably in place and for cushioning the effect of the piston blows. j

Another important object is to providel means operating in conjunction with the' cushioning means for locking the nuts of EL the holding-bolts and preventing the slackening or loosening of such nuts under the: heavy jars and vibrations due to the recip-aV rocations of the piston land its connected parts. f

The invention consists in certain novel` features of arrangement and details of con-` struction by which the above objects are attained, to be hereinafter described and Vpointed out in the claims. l

The accompanying drawings show the invention as it has been carried out in practice ina head designed for service on an airoperated drill. l

Figure 1 is a front elevation of the headl and a portion of the drill-cylinder and conj,

nected parts. Fig. 2 is a correspondingI plan or end view seen from below with the drill-bearing portion of the piston shown in transverse section. Fig. 3 is an elevationshowing the interior face of one of the two halves or portions constituting the body of the head. Fig. 4 is a vert-ical section through the head, taken on the line 4-4 in Fig. 2. Fig. 5 is a corresponding 'sectionI taken on a plane at a right angle \to that of Fig. 4. Fig. 6 isa view Vof the under face or flange of the packing-sleeve. The remaining figures are on a larger scale and show the locking means for the sleeve holding bolts. Fig. 7 is a plan view ofthe upper faceof the locking-washer. Fig. 8 is a corresponding edge view. 'Fig 9 is a plan face of the saine washer.

showing the under longitudinally,

ceive the rectangular head E1 v' and having each a smaller recess a1 matching to the body of the bolt Fig'lO'is a view of the bearing face of one of the nuts. Fig. 11 isa corresponding elevation.

Similar let-ters of reference indicate the same parts 'in all the figures.

A is a portion of the lower end of the cylinder, and A1 is the front head madein two portions or halves each the counterpart of vthe other and held together by bolts A2.

The head thus joined is secured to thek cylinder by side-rods as usual and is bored and counter-bored to receive the piston-rod B, packing-sleeve VD and packing C. 'The packing-sleeve. oppositely located openings al, and is split the line of division passing through the openings 0l, 'to permit its appli'- cation around the piston rod and introduchas flange D1 -in which are tion within the head. On opposite sides of each portion of the head is a swell or lug A3 each recessed to produce when vapplied together a rectangular cavi-ty a adapted to reof'a bolt E,

and forming with A4 adapted to support the cavity a shoulders the heads E1 and resist downward strains on the bolts. 1 openings d in the flange D1 The latter extend through the and receive nuts E2. 'Between the iiange D1 and under face of the, head'A1 is a gasket F of rubber or sui-table elastic lor yielding material, serving as a cushionk to absorb shocks of impact upon the head and soften the transference of such shocks to the flange D1 and its holding-bolts E E1 E2.A Y

In order to insure the nuts E2 against loosening, the inner face of each is provided with a series of radial grooves e receiving corresponding rounded ridges'Gr1 on a washer G. The latter is Vheld against rotation by pins or projections G2 on the opposite face, received in corresponding Vnotches d1 formed in lthe abutting edges. of the flange D1 adjacent to each bolt-opeiiing d, 'as illustra-ted in Figs. 5 and 6.

In applying the sleeve the two sections are placedtogether encircling the piston rod, and the gasket F, which -is cut radially at one point to permit its application, is placed upon the upper face yof fthe flange D1 and the tubular sleeve' portion inserted within the hea d,fin which thebolts E haveY been prepin-recesses or viously positioned, with the lower ends of the bolts extended through the openings Z and similarly located openings in the gasket. rIhe washers are then passed over the boltends and the pins G2 engaged in the notches or pin-recesses all in the under face of the flange D1. The nuts E2 are then applied and screwed up against the washers which yields sufficiently by compressing the gasket F between the flange D1 and lower face of the head, to permit the lands or plane spaces between the grooves e on the nuts to ride over the ridges G2 on the washers unt-il a degrec of compression is attained at which further travel of the nuts is strongly resisted. At this point the nuts are turned enough farther to arrive at one of the positions in which the grooves and ridges coincide. Thus locked the nuts are held reliably against backing off and the sleeve is strongly but yieldingly joined to the head.

Cotterpins H inserted through holes a2 a2 drilled through the lugs A3 from side to side, serve to maintain the bolts in position while the parts are being assembled and also as auxiliary means to the frictional grip of the bolts in the recesses a a in preventing the displacement of the bolt-heads. The abutting edge of one of the sleeve sections is notched as in Fig. 4 to receive a correspondingly shaped swell on the other, thus insuring the proper relation of the halves.

The failure of a front head as commonly constructed is usually due to internal wear. By the employment of the sleeve such wear is received by the latter, and by a reversal of the above operation the sleeve when worn may be easily removed and a new one substituted, thus increasing the life of the head indefinitely, The improved construction also permits the easy removal of old and the introduction of new packing rings C as required, and allows the sleeve to be made of material different from that of the head and better| adapted to resist wear.

Although the invention is shown and described as applied -to an air-head it will loe understood that it will serve successfully with the packing-sleeve or gland and packing of a steam-head.

By forming the recesses a a on the exterior of the head and partly in both portions thereof, they are easily accessible to the tools of the machinist, and any surplus metal in the angles, due to imperfect casting, may be easily reached and removed or other imperfections corrected in any parts of the recesses.

1. In a rock-drill, a cylinder-head divided axially into two portions, a packingsleeve having a flange and received in said cylinder-head, holding-bolts securing said sleeve to said cylinder-head, the latter having cavities in its exterior receiving the heads of said holding-bolts, and formed by recessing adjacent parts of both of said cylinder-head portions, the body portions of said bolts lying in recesses opening into said cavities and formed partially in both of said cylinder-head portions, said bolts extending axially of said cylinder-head through said flange, and receiving nuts on their outer ends.

2. A cylinder-head, a packing-sleeve having a flange, elastic material between said sleeve and cylinder-head, bolts received in said cylinder-head and extending through said flange, pin-recesses in the latter adjacent to said bolts, a washer for each of said bolts, pins on one face of said washer engaged in said pin-recesses, radial ridges on the other face of said washer, and a nut for each of said bolts having grooves in its bearing face matching to the ridges on said washer.

3. A cylinder-head, a packing-sleeve having a flange and divided axially into two portions, said flange having bolt-openings and pin-recesses formed partly in each of such portions, an elastic gasket between said flange and cylinder-head, holdingbolts secured to said cylinder-head and extending through said bolt-openings and gasket, a washer for each of said bolts, pins on one face of said washer engaged in said pin-recesses, radial ridges on the other face of said washer, and a nut for each of said bolts, having grooves in its bearing face matching to the ridges on said washer.

4. In a rock-drill, a cylinder-head divided axially into two portions, a packing-sleeve and flange thereon divided axially into two portions, said flange having bolt-openings and pin-recesses formed partly in each of said flange portions, an elastic gasket between said flange and cylinder-head, holding-bolts securing said sleeve to said cylinder-head and extending through said gasket and bolt-openings, said cylinder-head having cavities in its exterior receiving the heads of said bolts and formed by recessing adjacent parts of both of said cylinderhead portions, the body portions of said bolts lying in recesses opening into said cavities and formed partially in both of said cylinder-head portions, a washer for each of said bolts, pins on one face of said washer engaged in said pin-recesses, radial ridges on the other face of said washer, and a nut for each of said bolts having grooves in its bearing face matching to the ridges on said washer.

5. A cylinder head formed in sections, each section having a lug with the lugs recessed upon their adjacent faces forming a cavity to receive the head of a securing bolt, said recesses being accessible from the exterior of the head.

6. A cylinder head formed in sections,

WARREN WOOD.

each section having a lug with the lugs recessed upon their adjacent faces forming a cavity to receive the head of a securing bolt, said recesses being accessible from the eX- terior of the head, said recesses having shoulders to support the head of the bolt and resist downward strain thereon.

Witnesses:

ROBERT D. BUGKLEY, CHARLES R. SEARLE.

Copies of this patent may be obtained for iive cents each, by addressing the Commissioner of Patents, Washington, D. C. 

